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Subject - Chemistry:

Basics

MCQ - 302-2488

Question:

Which of the following mixture is not a buffer

  1. NH4OH + NH4Cl
  2. H2 CO3 + NaHCO3 in a 1:1 mole ratio
  3. NH3 + HCl is a 2:1 mole ratio
  4. H2 CO3 + NaHCO3 in a 1:1 mole ratio

Correct Answer: C

Explanation:

A buffer solution is an aqueous solution consisting of a mixture of a weak acid and its conjugate base, or vice versa. Its pH changes very little when a small or moderate amount of strong acid or base is added to it and thus it is used to prevent changes in the pH of a solution.NH3 + HCl is a 2:1 mole ratio is not a buffer it is a mixture of acid and base.

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